Anomalous dust temperature in dusty plasma experiments

Khare, Avinash; Merlino, R. L.; Shukła, P. K.

doi:10.1016/j.physleta.2011.06.009

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…A calculation of the dust free energy has been presented earlier [22,23]. However, in these calculations the dust temperature T d was taken to be zero and electron and ion temperatures were taken to be equal.…”

Section: Discussionmentioning

confidence: 99%

Thermal energy density of dust in dusty plasmas: Experiment and theory

et al. 2013

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A surprising observation in dusty plasma experiments is that the dust thermal energy density, P_{d}∝n_{d}T_{d}, is typically much greater than n_{d}T_{n} (where n_{d} and T_{d} are the dust density and temperature, and T_{n} is the neutral temperature), even though the dust particles would be expected to be in thermal equilibrium with the neutrals. We show here, theoretically and experimentally, that the anomalously high dust thermal energy density can be accounted for if electrostatic interactions between the dust particles and the background plasma are taken into account. Thus, the dust pressure in dusty plasma is mostly of electrostatic origin.

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Section: Discussionmentioning

confidence: 99%

Thermal energy density of dust in dusty plasmas: Experiment and theory

et al. 2013

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“…Dust particles may be heated by thermal electric field fluctuations in the background plasma and via DAWs driven by an ion-flow instability. [24][25][26] We expect dust trapped in the potential well of the mesh to have a much lower kinetic energy than dust trapped in the primary cloud near the anode due to the weaker confining potential and the absence of DAWs (i.e., an ion-flow). The absence of DAWs leaves only thermal electric field fluctuations as a potential heating source.…”

Section: -2mentioning

confidence: 99%

Experimental quiescent drifting dusty plasmas and temporal dust acoustic wave growth

et al. 2011

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We report on dust acoustic wave growth rate measurements taken in a dc (anode glow) discharge plasma device. By introducing a mesh with a variable bias 12-17 cm from the anode, we developed a technique to produce a drifting dusty plasma. A secondary dust cloud, free of dust acoustic waves, was trapped adjacent to the anode side of the mesh. When the mesh was returned to its floating potential, the secondary cloud was released and streamed towards the anode and primary dust cloud, spontaneously exciting dust acoustic waves. The amplitude growth of the excited dust acoustic waves was measured directly along with the wavelength and Doppler shifted frequency. These measurements were compared to fluid and kinetic dust acoustic wave theories. As the wave growth saturated a transition from linear to nonlinear waves was observed. The merging of the secondary and primary dust clouds was also observed. V

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“…It should be known that the electrostatic temperature tends to become high in laboratory dusty plasmas due to thermal electric field fluctuations [35]. However, for the weak-coupling dust acoustic models (for which κ 0 1 and 1), the electrostatic temperature terms tend to zero, which make α = 1 and β = 0 [23].…”

Section: A Linear Analysismentioning

confidence: 99%

Nonlinear Dust Acoustic Waves in Strongly Coupled Quantum Dusty Plasmas

Luo

Chen

Liu

2015

IEEE Trans. Plasma Sci.

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Using a set of fluid equations to describe the inertial dust grain component in dense collisionless unmagnetized quantum dusty plasmas, where the electrons and ions obey the Thomas-Fermi density distribution, the propagation characteristics of dust acoustic solitary waves (DASWs) are studied. First, a linear dispersion of dust acoustic wave (DAW) is obtained, and it is shown that the DAW is modified by a strongly coupled parameter. Then for small amplitude solitary waves, the Korteweg-de Vries equation is obtained by applying the reductive perturbation technique. For arbitrary amplitude solitary waves, the Sagdeev potential method is employed and the Sagdeev potential is analyzed. In both cases, the effect of dust coupling parameters on the characteristics of DASWs in our system are analyzed.Index Terms-Dust acoustic waves (DAWs), quantum dusty plasma, strongly coupled regime.

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Anomalous dust temperature in dusty plasma experiments

Cited by 16 publications

References 23 publications

Thermal energy density of dust in dusty plasmas: Experiment and theory

Thermal energy density of dust in dusty plasmas: Experiment and theory

Experimental quiescent drifting dusty plasmas and temporal dust acoustic wave growth

Nonlinear Dust Acoustic Waves in Strongly Coupled Quantum Dusty Plasmas

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